[lucozade]

What you're effectively saying is that, if the recruiter puts enough effort in, they can find out how good you really are.

This is, of course, true. The problem is that that's not the problem they're trying to solve. What the recruiter is doing is finding people that have a high chance of meeting their criteria in a reasonably scalable way. Or facetiously, you may think it's about you but it's not.

Now, most of the ways they go about this aren't actually that great. But having the recruiters running around after you will definitely be worse.